canon rumors FORUM

Simple answer is yes. They are similar but the 1D X has its own Digic 4 processor dedicated to AF/metering, that's on top of the 2 Digic 5+s, the 1D X also has spot metering linked to the AF point and EOS iTR which helps with tracking depending on the mode you are in.

The 1D X can AF at f/8 though that is said to be coming to the 5D Mark III in April, or May (forget which).

I own both cameras and in my daily usages I've found the AF performance to be very similar with the 1DX having a what seems like only a slight edge.

Where the 1DX shines for me is in the low noise of the files that come out of it. Simply amazing camera in low light situations and clearly superior to my 5DMkIII. I often shoot at ISO 10,000 with my 1DX but won't go above 6,400 on my 5DMkIII (just personal taste). Other than that, they seem to lock focus about the same, so if AF is your only concern, I'm not sure the 1DX's price is justifiable for your needs. However if you care about low noise and super fast fps e.g. shooting sports etc... indoors, then the 1DX is your camera.

I am happy with the 1DX...focuses fast and accurate... amazing on multi point focus + servo... amazing.

image quality is good and fabulous at high iso 10000 still very usable.

one shoot went right through heavy rain... 1DX 70-200II and radio transmitter did not fail.not even 600EX in small box that also got soaked... I am so happy with the camera and system... good IQ and Durable system.

I own both cameras and in my daily usages I've found the AF performance to be very similar with the 1DX having a what seems like only a slight edge.

Where the 1DX shines for me is in the low noise of the files that come out of it. Simply amazing camera in low light situations and clearly superior to my 5DMkIII. I often shoot at ISO 10,000 with my 1DX but won't go above 6,400 on my 5DMkIII (just personal taste). Other than that, they seem to lock focus about the same, so if AF is your only concern, I'm not sure the 1DX's price is justifiable for your needs. However if you care about low noise and super fast fps e.g. shooting sports etc... indoors, then the 1DX is your camera.

The 1Dx sure has the high ISO edge over the 5D3. Well, for me, budgetwise and as an amateur, the 5D3 serves perfectly. I even dare to go 51k...;-)

I have used both cameras for sports and wildlife. The 1DX has superior focus tracking. The 5dMKIII is no slouch but when the 1DX locks on, it stays on. The 5DMKIII tends to jump in and out a little. The 12 FPS on the 1DX comes in handy when shooting sequences of birds flying or sports images. Image quality is very good from both although I find dynamic range lacking. Blown highlights can be an issue on properly exposed images from both cameras. The 1DX is about 2/3 of a stop better at high ISOs. I would say the 5dMKIII is clean through IS 4000 and the 1DX through ISO 6400. The 1DX seems to underexpose images by about 1/3 of a stop compared to the 5DMKIII. The 1DX is a tank but handles really well. The build quality of the 5DMKIII is miles ahead of the previous version but it still feels unresponsive in certain situations. Shooting baseball, for example, I really had to anticipate a batter's swing to get a ball in the image; otherwise, the camera would fire a hair late. Hope that helps.

I just shot these for a client this past weekend. The scenario was my back to a 9 foot jump, them launching over my head, and the 5d III picking them up within nano seconds of hitting the jump. Most series had 4 out of 5 tack sharp images. Mind you, my back was to the jump, so I literally had to rely on the sound of them getting closer and judge the launch timing. I've owned 3 1 series cameras, and you will have to pry my 5d III from my cold dead hands at a huge price difference for 98% of the same performance.

I just shot these for a client this past weekend. The scenario was my back to a 9 foot jump, them launching over my head, and the 5d III picking them up within nano seconds of hitting the jump. Most series had 4 out of 5 tack sharp images. Mind you, my back was to the jump, so I literally had to rely on the sound of them getting closer and judge the launch timing. I've owned 3 1 series cameras, and you will have to pry my 5d III from my cold dead hands at a huge price difference for 98% of the same performance.

I just shot these for a client this past weekend. The scenario was my back to a 9 foot jump, them launching over my head, and the 5d III picking them up within nano seconds of hitting the jump. Most series had 4 out of 5 tack sharp images. Mind you, my back was to the jump, so I literally had to rely on the sound of them getting closer and judge the launch timing. I've owned 3 1 series cameras, and you will have to pry my 5d III from my cold dead hands at a huge price difference for 98% of the same performance.

I just shot these for a client this past weekend. The scenario was my back to a 9 foot jump, them launching over my head, and the 5d III picking them up within nano seconds of hitting the jump. Most series had 4 out of 5 tack sharp images. Mind you, my back was to the jump, so I literally had to rely on the sound of them getting closer and judge the launch timing. I've owned 3 1 series cameras, and you will have to pry my 5d III from my cold dead hands at a huge price difference for 98% of the same performance.